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Ok to make a long story short, I am an avid 22 year old fisher. I was out on a stream on Sunday and today enjoying the holiday and winding down from the week. While wading I happened to catch a glimpse of a rock in the water that was a beautiful green. I reached down and grabbed this weird, "holy" rock, and when I say holy, it has a few crevasse's that look like small BB's. Some were shiny and some were only color distinct when wet. They all appear to be the same as the rest. Most are green, but the majority of ones I found today were a smokey greyish black. All of the very ones that appear to be chipped or what not are smooth and very glossy, with the small bb marks being sharp to the touch when you run your finger over it. I collected a lot of these rocks (enough to fill 2 plastic bags to the point they could break)because they were cool looking and I want to do something with them. The one of the older guys who were with me said its from a smelting furnace up the stream a few miles. It hasnt been active in centuries. I started looking around and couldnt find a thing on them. I used yahoo answers and someone said it isnt slag, its silica, mentioning that there is a possibility that the black ones could be obsidian? I dont want a value of these rocks i just want to do something cool with them. They just seem like they would make cool beads if they were polished up and cut down. Basically Im asking if anyone can help me identify them and give me some common uses of them. I will attach a picture of them. Please help me :)

Its a stream about a mile down stream of turn of the century smelting furnace. I looked up silica glass and it is known to be a by product of smelting iron, but it looked nothing like the pictures. And the black ones are harder to actually find. Rather than the green ones.

I'd be very surprised if it wasn't a smelting by-product. True, it doesn't look like the typical slag, but it certainly doesn't look natural either, and slag can look like anything glassy. Considering its setting near the smelter its unlikely that its not slag.